/**
 * Software License, Version 1.0
 * 
 * Copyright 2003 The Trustees of Indiana University.  All rights reserved.
 * 
 *
 *Redistribution and use in source and binary forms, with or without 
 *modification, are permitted provided that the following conditions are met:
 *
 *1) All redistributions of source code must retain the above copyright notice,
 * the list of authors in the original source code, this list of conditions and
 * the disclaimer listed in this license;
 *2) All redistributions in binary form must reproduce the above copyright 
 * notice, this list of conditions and the disclaimer listed in this license in
 * the documentation and/or other materials provided with the distribution;
 *3) Any documentation included with all redistributions must include the 
 * following acknowledgement:
 *
 *"This product includes software developed by the Community Grids Lab. For 
 * further information contact the Community Grids Lab at 
 * http://communitygrids.iu.edu/."
 *
 * Alternatively, this acknowledgement may appear in the software itself, and 
 * wherever such third-party acknowledgments normally appear.
 * 
 *4) The name Indiana University or Community Grids Lab or NaradaBrokering, 
 * shall not be used to endorse or promote products derived from this software 
 * without prior written permission from Indiana University.  For written 
 * permission, please contact the Advanced Research and Technology Institute 
 * ("ARTI") at 351 West 10th Street, Indianapolis, Indiana 46202.
 *5) Products derived from this software may not be called NaradaBrokering, 
 * nor may Indiana University or Community Grids Lab or NaradaBrokering appear
 * in their name, without prior written permission of ARTI.
 * 
 *
 * Indiana University provides no reassurances that the source code provided 
 * does not infringe the patent or any other intellectual property rights of 
 * any other entity.  Indiana University disclaims any liability to any 
 * recipient for claims brought by any other entity based on infringement of 
 * intellectual property rights or otherwise.  
 *
 *LICENSEE UNDERSTANDS THAT SOFTWARE IS PROVIDED "AS IS" FOR WHICH NO 
 *WARRANTIES AS TO CAPABILITIES OR ACCURACY ARE MADE. INDIANA UNIVERSITY GIVES
 *NO WARRANTIES AND MAKES NO REPRESENTATION THAT SOFTWARE IS FREE OF 
 *INFRINGEMENT OF THIRD PARTY PATENT, COPYRIGHT, OR OTHER PROPRIETARY RIGHTS. 
 *INDIANA UNIVERSITY MAKES NO WARRANTIES THAT SOFTWARE IS FREE FROM "BUGS", 
 *"VIRUSES", "TROJAN HORSES", "TRAP DOORS", "WORMS", OR OTHER HARMFUL CODE.  
 *LICENSEE ASSUMES THE ENTIRE RISK AS TO THE PERFORMANCE OF SOFTWARE AND/OR 
 *ASSOCIATED MATERIALS, AND TO THE PERFORMANCE AND VALIDITY OF INFORMATION 
 *GENERATED USING SOFTWARE.
 */
package cgl.narada.transport.sslHttpBase;

import java.io.IOException;

/**
 * Message that indicates the creation or destruction of a channel.
 *
 * @author  John Yin
 * @version 1.0
 */

public class LinkMessageCommand extends LinkMessage {

    public static final byte TRANSPORT_COMMAND_TYPE = 2;

    public final static byte CREATE_CHANNEL = 0;
    public final static byte DESTROY_CHANNEL = 1;
    public final static byte UPDATE_CHANNEL_ID  = 2;
    public final static byte TRANSPORT_QUERY    = 3;

    // The type of update channel message.
    private byte m_command = CREATE_CHANNEL;
    private String m_string = null;

    /**
     * ---------------------------------------------------------------------
     */
    public LinkMessageCommand() {
    }

    /**
     * ---------------------------------------------------------------------
     */
    public LinkMessageCommand(byte type,String channelID) {
        super(channelID);
        setMessageType(TRANSPORT_COMMAND_TYPE);
        m_command = type;
    }

    /**
     * ---------------------------------------------------------------------
     */
    public byte[] toBytes() {
        constructMessage();
        return super.toBytes();
    }

    /**
     * ---------------------------------------------------------------------
     */
    public void setMessage(String msg) {
        m_string = msg;
    }

    /**
     * ---------------------------------------------------------------------
     */
    public String getMessage() {
        return m_string;
    }

    /**
     * --------------------------------------------------------------
     * One of CREATE_CHANNEL, DESTROY_CHANNEL;
     */
    public byte getCommandType() {
        return m_command;
    }

    /**
     * --------------------------------------------------------------
     */
    public void parseData(byte[] payload) throws IOException {
        super.parseData(payload);
        payload = getPayload();
        m_command = payload[0];
        m_string = importString(payload,1);
    }

    /**
     * ---------------------------------------------------------------------
     */
    public void constructMessage() {
        byte[] payload = null;

        int stringSize = (m_string != null) ? m_string.length() : 0;
        payload = new byte[5+stringSize];
        if (m_string != null) exportString(payload,1,m_string);
        payload[0] = m_command;
        setPayload(payload);
    }

    /**
     * --------------------------------------------------------------
     * Unit Testing.
     */
    public static void main(String[] args) throws IOException  {
        LinkMessageCommand msrc = new LinkMessageCommand(TRANSPORT_QUERY,"a");
        msrc.setMessage("helloworld");
        LinkMessageCommand mdst = new LinkMessageCommand();
        mdst.parseData(msrc.toBytes());

        if (!mdst.getLinkID().equals("a")) {
            System.out.println("===Invalid channel id");
        }

        if (mdst.getMessage() == null || !mdst.getMessage().equals("helloworld")) {
            System.out.println("===Bad message");
        }

        if ((msrc.getMessageType() != LinkMessageCommand.TRANSPORT_COMMAND_TYPE) ||
            (mdst.getMessageType() != LinkMessageCommand.TRANSPORT_COMMAND_TYPE)) {
            System.out.println("===Error in message type: "+msrc.getMessageType());
        }

        System.out.println("Completed...Command Message: "+mdst.getMessage());
    }
}
